package com.skillworld.webapp.web.pages.rest.school;

import org.apache.tapestry5.annotations.ContentType;
import org.apache.tapestry5.annotations.Property;
import org.apache.tapestry5.annotations.SessionState;
import org.apache.tapestry5.ioc.annotations.Inject;
import org.apache.tapestry5.services.Request;

import com.skillworld.webapp.model.course.Course;
import com.skillworld.webapp.model.courseservice.CourseInfo;
import com.skillworld.webapp.model.courseservice.CourseService;
import com.skillworld.webapp.model.enrollment.Enrollment;
import com.skillworld.webapp.model.lesson.Lesson;
import com.skillworld.webapp.web.util.ErrorMessages;
import com.skillworld.webapp.web.util.UserSession;

import es.udc.pojo.modelutil.exceptions.InstanceNotFoundException;

@ContentType("text/xml")
public class ViewCourse {

	@SuppressWarnings("unused")
    @Property
    private String errorMessage = null;      
    
    @SuppressWarnings("unused")
    @Property
    private Course course;
    
    @SuppressWarnings("unused")
    @Property
    private boolean enrolled;
    
    @SuppressWarnings("unused")
    @Property
    private Enrollment enrollment;
 
    @SuppressWarnings("unused")
    @Property
    private Lesson lesson;  // loop iterator
    
    @Inject
    private CourseService courseService;
    
    @SessionState(create=false)
    private UserSession userSession;
   
    private boolean userSessionExists;
    
    @Inject
    private Request request;
    
    
    void onPassivate() 
    {
        return;
    }
    
    void onActivate()
    {       
        if (!userSessionExists)
        {
            errorMessage = ErrorMessages.NOT_LOGGED_IN;
            return;
        }
        
        String courseParam = request.getParameter("course");
        if (courseParam == null)
        { 
            errorMessage = ErrorMessages.INVALID_ARGUMENTS;
            return;
        }
               
        try 
        { 
            long courseId = Long.parseLong(courseParam);
            CourseInfo courseInfo = 
                courseService.viewCourse(courseId, userSession.getUserId());
            course = courseInfo.getCourse();
            enrollment = courseInfo.getEnrollment();
            enrolled = courseInfo.isEnrolled();
        }
        catch (NumberFormatException e)
        { errorMessage = ErrorMessages.INVALID_ARGUMENTS; }
        catch (InstanceNotFoundException e) 
        { errorMessage = ErrorMessages.COURSE_NOT_FOUND; }
    }
}
